Antibody catalyzed modification of amino acids. Efficient hydrolysis of tyrosine benzoate
作者:Fabio Benedetti、Federico Berti、Massimiliano Flego、Silvia Peressini、Alfonso Colombatti、Lucia Gardossi、Paolo Linda
DOI:10.1039/b100450f
日期:——
Esterase antibody 522c2, the first example of a catalytic
antibody specifically programmed to control the reactivity of functional
groups on the side chain of tyrosine, accelerates the hydrolysis of
benzoate esters of L-tyrosine and tyrosine-containing dipeptides
by a factor of 104 and is moderately active against other
benzoate esters.
Synthesis, Characterization and Antimicrobial activity of protected dipeptides and their deprotected analogs
作者:Jatinder Gill、Simranjeet Singh、Nidhi Sethi
DOI:10.13005/ojc/310149
日期:2015.3.28
Peptides are the chemical compounds which consist of amino acids coupled together by peptide linkage. Peptide derivatives are synthesized by coupling the carboxyl group of one amino acid with amino group of other. Due to the possibilities of fortuitous and unintentional reactions, various protecting groups are used to protect the carboxylic acid as well as amino groups of both the amino acids. These peptide derivatives are associated with a variety of pharmacological activities including antibacterial and antifungal activities. While doing our analysis some of the dipeptides were synthesized in a reasonable yield and purity which were fully characterised by FTIR and H1 NMR. The antimicrobial activity of these derivatives was studied and these were found to be active against two strains of fungi (Aspergillus fumigatus & Pencillium chrysogenum) and two strains of bacteria (E. coli and Salmonella typhimurium). This provides for a future insight to work on the synthesisof these dipeptide derivatives to achieve their stability.
a Pd-catalyzed picolinamide-directed site-selective C(sp2)–H sulfonylation of amino acids and peptides with sodium sulfinates in moderate to good yields. Sulfonylation of levodopa and dopamine drug molecules and late-stage directed peptide sulfonylation are studied for the first time. Broad substrate scope having various functionalities, late-stage drug modifications, and various post synthetic utilities
Structure–Activity Relationships of <i>cyclo</i>(<scp>l</scp>-Tyrosyl-<scp>l</scp>-tyrosine) Derivatives Binding to <i>Mycobacterium tuberculosis</i> CYP121: Iodinated Analogues Promote Shift to High-Spin Adduct
作者:Sunnia Rajput、Kirsty J. McLean、Harshwardhan Poddar、Irwin R. Selvam、Gayathri Nagalingam、James A. Triccas、Colin W. Levy、Andrew W. Munro、Craig A. Hutton
DOI:10.1021/acs.jmedchem.9b01199
日期:2019.11.14
A series of analogues of cyclo(L-tyrosyl-L-tyrosine), the substrate of the Mycobacterium tuberculosis enzyme CYP121, have been synthesized and analyzed by UV-vis and electron paramagnetic resonance spectroscopy and by X-ray crystallography. The introduction of iodine substituents onto cyclo(L-tyrosyl-L-tyrosine) results in sub-mu M binding affinity for the CYP121 enzyme and a complete shift to the high-spin state of the heme Fe-III. The introduction of halogens that are able to interact with heme groups is thus a feasible approach to the development of next-generation, tight binding inhibitors of the CYP121 enzyme, in the search for novel antitubercular compounds.
Indolacetoxyacetylaminosäurederivate, Verfahren zu ihrer Herstellung und ihre Verwendung in Arzneimittel